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<u><b><font color="#000080">Entity Relation Model</font></b></u>
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This is intended to be the main working window when altering the structure of a data base.
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All main tasks can be accessed from this frame:<br>
&nbsp;&nbsp;&nbsp;* Creating tables<br>
&nbsp;&nbsp;&nbsp;* Modifying (alter) tables and relations<br>
&nbsp;&nbsp;&nbsp;* Delete table and relations<br>
&nbsp;&nbsp;&nbsp;* Etc.
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All buttons in the toolbar have a ToolTip text that should be
enough to understand what is their purpose.
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Besides that, most part of the actions can be done using the
mouse or a combination of keys.
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Here are available mouse actions for Windows and Relations:
<ul>
   <li>Double-click show properties (windows & relations)
   <li>Drag on title, drags window (only windows)
   <li>Drag on bottom border, resizes window (only windows)
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Right-click on Diagram background shows a pop-up with same options as those shown 
in the Diagram ToolBar.
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In the future drag and drop to create relations will be implemented.
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